Huawei HCIE-Datacom V1.0 H12-891_V1.0 Exam Dumps: Updated Questions & Answers (April 2026)

Comprehensive and Detailed In-Depth Explanation:

The gRPC-based telemetry protocol utilizes protocol buffers (.proto files) to define the structure and data format used in communication between a client and a server. In Huawei ' s telemetry architecture, these files are categorized based on their roles in the data model.

1. RPC Layer:

File: huawei-grpc-dialin.proto

Explanation:

The RPC layer (Remote Procedure Call layer) handles communication between the client and server.

The file huawei-grpc-dialin.proto defines the gRPC service interfaces, message structures, and procedures for remote method invocation.

It is essential for establishing communication and invoking telemetry data collection.

Function: Manages dial-in and dial-out connections between the telemetry client and the server.

2. Telemetry Layer:

File: huawei-telemetry.proto

Explanation:

The telemetry layer is responsible for collecting, packaging, and exporting telemetry data.

The file huawei-telemetry.proto contains the data model used for telemetry reporting, including streaming data formats and telemetry messages.

It defines how the collected data is organized and transmitted.

Function: Provides a structured way to export telemetry data in real-time or batch mode.

3. Service Data Layer:

File: huawei-debug.proto

Explanation:

The service data layer contains data models related to diagnostics, debugging, and operational data.

The file huawei-debug.proto is used to collect debugging information from network devices.

This file is crucial for troubleshooting and monitoring the health of the system.

Function: Facilitates debugging and diagnostic telemetry data collection.

Why This Mapping Is Correct:

The mapping is based on the functional role of each layer and the purpose of each .proto file in the Huawei gRPC-based telemetry architecture.

Correctly identifying the file location is crucial for effective telemetry configuration and data collection.

Comprehensive and Detailed In-Depth Explanation:

By default, OSPF does not automatically associate a domain ID with a process ID. The concept of " domain ID " is primarily used when redistributing routes between OSPF and BGP, particularly in MPLS VPN scenarios. The domain ID in OSPF helps maintain loop prevention and correct route advertisement between different OSPF domains. You can manually configure the domain ID using the domain-id command within the OSPF process view, but it is not inherently set to the process ID.

Error analysis:

The error SSLError and CertificateError indicates the server ' s SSL certificate ' s hostname doesn ' t match the IP address being used in the request.

This happens when a certificate is issued for a domain (like devzone.huawei.com), but the client accesses it via an IP address (139.9.213.72), causing a trust failure.

Correct statements:

A — ✅: The client doesn ' t trust the SSL certificate → correct.

B — ✅: SSL verification fails due to hostname mismatch.

C — ✅: Disabling verification with verify=False bypasses the check (only recommended in lab/testing environments).

D — ❌: Uses http instead of https, which changes protocol and defeats the purpose of SSL. Also uses POST without API path.

Correct answers: A, B, C

In OSPFv3, Link-LSA (Type 8) is generated by a router for each of its interfaces to advertise:

The router ' s link-local address on that interface.

The IPv6 prefixes associated with the interface.

Flags and options, such as router priority or loopback indicators.

From the output:

Link-LSA (Interface GigabitEthernet0/0/0)

Originating Router: 10.1.2.2

Link-Local Address: FE80::2E0:FCFF:FECD:4F79

Prefix: 2001:DB8:2345:23::/64

A. The link-local address of R2’s GE0/0/0 is FE80::2E0:FCFF:FECD:4F79→ This matches the Link-Local Address field in the LSA. ✅

B. The IPv6 address prefix of R2’s GE0/0/0 is 2001:DB8:2345:23::/64→ This matches the Prefix field in the LSA. ✅

C. This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation→ ❌ Incorrect.

The Link-LSA does not provide any indication about external route capabilities.

It simply advertises interface-specific IPv6 and link-local info.

Whether R2 supports external routes depends on Type 5 (External) or Type 7 (NSSA) LSAs, not Link-LSAs.

D. This LSA is generated by R2→ The Originating Router: 10.1.2.2 is R2’s router ID, so this LSA is definitely generated by R2. ✅

Correct Answers: A, B, D

The Link-LSA in OSPFv3 contains:

The link-local address used by the originating router on the link.

A list of all IPv6 prefixes associated with the link.

Flags such as router priority and the Router-LSA options.

These LSAs are always generated by the router itself and are not flooded beyond the link.

OSPF (Open Shortest Path First) Router-LSA (Type 1 LSA) describes all directly connected OSPF links of a router and their types. The following link types can appear in a Router-LSA:

Point-to-Point (P-2-P) (B) – Represents a direct connection between two routers.

Virtual Link (Vlink) (C) – Used to connect an area to the backbone (Area 0) when a direct connection is unavailable.

Stub Network (StubNet) (D) – Represents a network with only one exit point (e.g., a loopback interface or passive interface).

Incorrect Option:

TransNet (A) – Incorrect!

Transit networks appear in Network LSAs (Type 2), not Router LSAs.

Reference from Huawei HCIE-Datacom Documentation:

Huawei OSPF Configuration Guide – Router-LSAs and Link Types

HCIE-Datacom Training Material – OSPF LSAs and Topology Advertisement

IPsec (Internet Protocol Security) provides secure communication over IP networks through several essential functions. Let’s explain each function and its purpose:

1. Data Origin Authentication:

Description: The receiver verifies the identity of the sender.

Explanation:

This function ensures that the data received actually comes from the claimed source.

IPsec achieves this using IKE (Internet Key Exchange) and digital signatures.

The Authentication Header (AH) and Encapsulating Security Payload (ESP) support authentication.

Use Case: Verifying that a message claiming to be from a specific IP address is genuinely from that source.

2. Data Encryption:

Description: The sender encrypts the data, and the receiver decrypts the data.

Explanation:

Encryption ensures data confidentiality by transforming readable data (plaintext) into unreadable data (ciphertext).

Only the intended receiver with the correct decryption key can convert the ciphertext back to plaintext.

Common encryption algorithms used include AES (Advanced Encryption Standard) and DES (Data Encryption Standard).

Use Case: Protecting sensitive data transferred over public networks.

3. Data Integrity:

Description: The receiver verifies received data to determine whether the data has been tampered with.

Explanation:

Ensures that the data was not altered during transmission.

Uses cryptographic hash functions (e.g., SHA-1, SHA-256) to generate a message digest.

The digest is sent with the data and verified on the receiving side.

Use Case: Detecting any changes made to the data packet during transmission.

4. Anti-Replay:

Description: The receiver rejects duplicate data packets.

Explanation:

Prevents attackers from capturing packets and replaying them later.

Uses sequence numbers to detect replayed or duplicated packets.

The receiver keeps a sliding window of sequence numbers to compare incoming packets.

Use Case: Blocking malicious actors from sending previously intercepted packets to disrupt communication.

Why This Mapping Is Correct:

The functions and descriptions are aligned based on the core concepts of IPsec and the roles they play in ensuring secure data transmission.

Each function addresses a specific aspect of security: authentication, confidentiality, integrity, and replay protection.

In Huawei ' s SD-WAN architecture, the following channels are defined:

Management Channel (Callout 1)

Between iMaster NCE and Edge devices.

Used for device registration, configuration, and monitoring.

Encrypted with HTTPS.

Control Channel (Callout 2)

Between Edge devices and RR (Route Reflector).

Used for route exchange and control signaling, typically over MPLS or Internet.

Data Channel (Callout 3)

Between Edge to Edge (e.g., HQ to branch).

Used for actual service traffic transmission, carried over MPLS, Internet, or both.

Correct Mapping:

Management channel → Callout 1 (from iMaster NCE to Edge)

Control channel → Callout 2 (Edge to RR)

Data channel → Callout 3 (Edge to Edge, over MPLS/Internet)

Huawei Open Programmability System (OPS) and HTTP Request Headers

Huawei OPS allows network automation and programmability through HTTP-based APIs. When using Python scripts to send HTTP requests to network devices, the request headers must specify the content format for data exchange.

✅ B. Content-Type: text/json, Accept: text/json (Correct Answer)

Content-Type: text/json → Specifies that the request body contains JSON-formatted data.

Accept: text/json → Specifies that the response should be in JSON format.

Huawei telemetry supports multiple transport protocols such as gRPC, HTTP2, and Kafka. When using gRPC, it is typically paired with TLS for secure encrypted transmission. TLS ensures that telemetry data is not intercepted or modified during transport.

Exact Extract – Huawei HCIE-Datacom Guide – Telemetry Security Section:

“When using gRPC for telemetry data push, TLS must be configured to encrypt the transport channel between devices and collectors.”

Comprehensive and Detailed Explanation:

✔ SRv6 (Segment Routing over IPv6) works by encoding a segment list in the IPv6 header.

✔ How SRv6 Works:

The Segments Left field indicates the remaining segments in the path.

Each endpoint node processes the next segment and decrements Segments Left by 1.

The IPv6 Destination Address (DA) is updated to the next segment.

Thus, the statement is TRUE.

???? Reference: Huawei HCIE Datacom – SRv6 Packet Forwarding